Carbon Nanotube Synthesis from Algae Waste via Pyrolysis and Self-Ignition
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Solution Overview
Problem
Conventional methods for producing carbon nanotubes require pure carbon sources, limiting the utilization of waste materials from biodiesel production, such as microalgae membranes, which are rich in carbon but not easily convertible into nanotubes.
Innovation Solution
A process involving pyrolysis of the algae membrane to produce carbon black, followed by mixing with a substance having self-ignition conditions in a sealed chamber to generate carbon nanotubes, with optional repetition and purification techniques to enhance purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional methods (chemical vapor deposition, laser ablation, arc discharge) are used to produce carbon nanotubes, then high purity nanotubes can be obtained, but pure carbon sources are required which limits the utilization of waste materials
Solution Approach 1:
The patent changes the physical and chemical parameters of the carbon source by converting algae membrane into carbon black through pyrolysis, transforming it from an unsuitable waste material into a form that can undergo auto-ignition and form nanotubes. This parameter transformation enables waste materials to serve as effective carbon sources.
Solution Approach 2:
The patent introduces carbon black as an intermediary substance between the algae membrane and the final nanotube product. The carbon black serves as a mediator that can be mixed with auto-igniting substances and processed through controlled combustion to produce nanotubes, bridging the gap between waste material and desired product.
2Productivity
If algae membrane is directly used as carbon source, then waste utilization is improved, but the conversion to nanotubes is difficult and inefficient
Solution Approach 1:
The patent performs preliminary processing of the algae membrane by first converting it into carbon black through pyrolysis. This preliminary action transforms the difficult-to-process membrane material into a form (carbon black) that is much easier to handle, mix with auto-igniting substances, and convert into nanotubes through controlled combustion.
Solution Approach 2:
The patent replaces complex mechanical and chemical processing systems with a simpler auto-ignition-based combustion process. Instead of using elaborate chemical vapor deposition or arc discharge equipment, the invention uses the natural auto-ignition properties of carbon black mixed with appropriate substances to drive the nanotube formation, significantly simplifying the manufacturing process.
3Manufacturing precision
If multiple processing steps are used to purify carbon nanotubes, then purity is improved, but process complexity and time increase
Solution Approach 1:
The patent employs multiple sequential combustion processes where the carbon black is repeatedly mixed with auto-igniting substances and burned under controlled conditions. Each cycle continuously purifies the nanotubes by removing impurities through controlled oxidation, with each step building upon the previous one to achieve progressively higher purity without requiring complex separation equipment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process effectively converts waste algae membranes into carbon nanotubes with high purity, addressing the challenge of using waste carbon sources and improving nanotube production efficiency.
Implementation Method 1
The algae membrane is converted to carbon black using a pyrolysis process
Implementation Method 2
The chamber is then promoted to the self-ignition condition. Upon the ignition of the substance in the chamber, without external flam, the energy released from the ignition produces carbon nanotubes out of the carbon black
Data Source
AI summary
We disclose a process to produce carbon nanotubes from microalgae. Microalgae is been utilized for biodiesel production. The algal membrane resulted from oil extraction of microalgae is used here to produce carbon nanotubes. The process utilized for the conversion is composed of two steps, in the first step the algal membrane is converted to carbon black through a pyrolysis process in inert atmosphere, in the second step the resulted carbon black is converted to carbon nanotubes by mixing the carbon black with a fluid with known self ignition condition and subjecting the mix to said self ignition condition.